Extension for shotgun barrel



May 4, 1965 E. W. BRIDGE, SR

EXTENSION FOR SHOTGUN BARREL Filed Dec. 1, 1964 FIG.

25 22 3a /5 l6 20 M/VE/VTOI? QMV" ATTORNEY United States Patent 3,181,262 EXTENSION FOR SHOTGUN BARREL Edward W. Bridge, Sr., 1507 Foulkrodst, Philadelphia, Pa. Filed Dec. 1, 1964, Ser. No. 415,012 10 Claims. (Cl. 42-49) This invention relates to extensions for shotgun barrels and more particularly to an attachment which can be secured to and removed from the barrel of the shotgun.

It has heretofore been proposed to apply extensions to gun barrels for the purpose of increasing the length.

One suitable construction for this purpose is shown in my prior application filedMarch 23, 1964, Serial No. 353,814, now Patent No. 3,163,953, and the present invention is an improvement over that extension.

It is the principal object of the present invention to provide an attachment for gun barrels which has improved self centering characteristics.

It is a further object of the present invention to provide an attachment for gun barrels which can be quickly and easily attached to existing gun barrels without modification or change thereof, and which has greater adaptability of different sizes of gun barrels than attachments heretofore available.

It is a further object of the present invention to provide an attachment for gun barrels of the character aforesaid by which the action of the barrel can be quickly and easily changed to accommodate different types of shooting, i.e. rapidly moving targets at close range or skeet targets, or for handicap trap shooting or for shooting ducks or geese.

Other objects and advantageous features of the invention will be apparent from the description and claims.

The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part thereof, in which:

FIGURE 1 is a view in elevation of the muzzle end of a shotgun barrel with the attachment of the invention mounted thereon;

FIG. 2 is a perspective view of the attachment removed from the gun;

FIG. 3 is a vertical longitudinal sectional. view of the attachment showing one form of bore;

FIG. 4 is a fragmentary sectional view showing another form of bore; and

FIG. 5 is a transverse sectional view taken approximately on the line 55 of FIG. 3.

It should, of course, be understood that the description and drawings herein are illustrative merely, and that various modifications and changes can be made in the structure disclosed without departing from the spirit of the invention.

Like numerals refer to like parts throughout the several views.

Referring now more particularly to the drawings the muzzle end of a gun barrel is shown, having a ventilating rib 11 thereon, and a front sight 12.

The attachment comprises a tube or sleeve 15, of alloy steel, in longitudinal axial alignment with the barrel 10. The sleeve 15 has opposite terminal end faces 16 and 17, an exterior enlargement extending longitudinally from the end face 16 in the form of an annular rim 18, with a shoulder portion 19 of reduced external diameter having a fileted connection 20 and a main exterior surface 21 having a fileted connection 22 and extending to the end face 17. t

Extending inwardly from the end face 16, a slot 23 of predetermined width is provided to accommodate the ventilating rib 11 on the barrel 10, and of a length as 3,131,262 Patented ii/lay 4, 1965 referred to below. Ribs 11, to be accommodated, may have widths of A", and /2", dependent upon the particular make and model.

Within the interior of the sleeve 15 and extending inwardly from the end face 16 a first bore 25 is provided, and tapered to provide a frustoconical seat bore converging to and terminating at a shoulder 26, for the reception of the tapered exterior surface 27 of a split clamping ring 28.

The ring 28 has a slot 29 therealong to clear the rib 11 and to permit the contraction or expansion upon movement of the ring 28 longitudinally of the seat 25.

The ring 28 has at its end an outwardly extending rim or flange 3d with an end face 31 and with a plurality of slots 34, extending radially inwardly from the periphery of the flange 3% to permit contraction and expansion of the flange 38 as required by the longitudinal axial movement of the ring 28. The flange 32 has a plurality of longitudinal axially disposed set screws 33 extending therethrough with their heads 34 engaging the end face 31 and with their shanks extending in intersecting relation to the end face 16 and in threaded engagement in the annular rim 13. The rim 18 is of sufiicient thickness and length to be rigid and free from deformation when the screws 33 are tightened to draw the ring 2% along the seat 25. The ring 28 has an interior face 35 engaging the barrel 10.

The seat bore 25 has, extending inwardly therefrom and to the end face 17, a second bore 36. The bore 36 can have any desired shape, in accordance with the choke action desired. The bore 36 can accordingly be of uniform diameter from end to end as in FIG. 3, or inwardly from the face 17 as in FIG. 4 can have a concentric cylindrical portion 36a of slightly reduced diameter to a tapered or frustoconical connecting portion 36b in advance thereof to provide a partial choke of the desired extent or a full choke, in a manner well known in chokes now available.

While the attachment as described is suitable for many purposes, including use with gun barrel having ventilating ribs 11 it can be used with barrels not so equipped. The sleeve 15, if desired, can have an auxiliary ventilating rib 37 secured thereto by screws 38 engaging in blind threaded holes 39 in the sleeve 15.

The attachment, with the bore 36 of the desired character, can be readily slid onto the muzzle end of a gun barrel 10, with the barrel end engaging the shoulder 26. The set screws 33 are then tightened to cause contraction of the sleeve 28 into gripping relation on the barrel 1i) and the gun is ready for use. The attachment can be quickly removed, if desired, by loosening the set screws 33 and manually drawing the attachment from the barrel 10. Another attachment having a different bore 36 can be quickly applied and fastened in place if desired.

It will thus be seen that an attachment for gun barrels has been provided with which the objects of the invention are attained.

I claim:

1. An attachment for a shotgun comprising a sleeve having an enlarged external rim at one end thereof and a slot extending inwardly from said one end, said sleeve having one end for the reception of the muzzle end of a shotgun barrel, said one end having an internal bore Within said rim, a ring longitudinally axially movable in said bore for clamping engagement with the exterior of said muzzle end, longitudinally axially disposed fasten ing members engaging said rim and said ring urging said ring into engagement with said muzzle end, said sleeve having a bore extending inwardly from the other end for controlling the shot pattern.

2. An attachment for a shotgun as defined in claim 1 in which said internal bore has an end shoulder for seating engagement by the end of the barrel.

3. An attachment for a shotgun as defined in claim 1 in which said fastening members comprise three longitudinally disposed circumferentially spaced set screws.

4. An attachment for a shotgun as defined in claim 1 having an auxiliary ventilating rib secured thereto on the exterior thereof and aligned with said slot.

5. An attachment for a shotgun as defined in claim 1 in which said last bore is of uniform diameter.

6. An attachment for a shotgun as defined in claim 1 in which said last bore provides at least a partial choke.

7. An attachment for the muzzle end of a shotgun barrel having a ventilating rib therealong comprising a sleeve having an enlarged external rim at one end thereof and a slot extending inwardly from said end for the reception of the rib, said sleeve having a tapered internal bore at one end thereof within said rib, said bore having an inner end shoulder for the seating of the muzzle end of the gun barrel, and a second bore longitudinally axially aligned with and extending from said first bore to the other end of said sleeve, an annular ring in said first bore having an exterior surface complemental to said tapered internal bore and an interior surface for engaging the barrel, said ring having a clamping shoulder and having a slot aligned with said first mentioned slot, a plurality of threaded members engaging said rim and said ring shoulder and disposed parallel to said interior surface to urge the ring into engagement with said muzzle end, said first mentioned slot being terminated in spaced relation from the inner end of said second bore.

8. An attachment for a shotgun as defined in claim 7 in which said second bore is of uniform diameter.

9. An attachment for a shotgun as defined in claim 7 in which said second bore is shaped to provide at least a partial choke.

10. An attachment for a shotgun as defined in claim 7 having an auxiliary ventilating rib secured thereto on the exterior thereof aligned with said slot.

No references cited.

BENJAMIN A. BORCHELT, Primary Examiner. 

1. AN ATTACHMENT FOR A SHOTGUN COMPRISING A SLEEVE HAVING AN ENLARGED EXTERNAL RIM AT ONE END THEREOF AND A SLOT EXTENDING INWARDLY FROM SAID ONE END, SAID SLEEVE HAVING ONE END FOR THE RECEPTION OF THE MUZZLE END OF A SHOTGUN BARREL, SAID ONE END HAVING AN INTERNAL BORE WITHIN SAID RIM, A RING LONGITUDINALLY AXIALLY MOVABLE IN SAID BORE FOR CLAMPING ENGAGEMENT WITH THE EXTERIOR OF SAID MUZZLE END, LONGITUDINALLY AXIALLY DISPOSED FASTENING MEMBERS ENGAGING SAID RIM AND SAID RING URGING SAID RING INTO ENGAGEMENT WITH SAID MUZZLE END, SAID SLEEVE HAVING A BORE EXTENDING INWARDLY FROM THE OTHER END FOR CONTROLLING THE SHOT PATTERN. 